While the organization has donated some funds over the years to Democratic party politicians, our research finds that over the last 8 election cycles 78% of political donations have gone to Republicans.

This finding is made quite clear in this graph produced by Open Secrets showing political donations made by Peabody Energy's PAC since 1990 broken down by political party:

Here's the breakdown of the last 15 years (8 election cycles) of political donations made by Peabody Energy's political action committee: